I built an intelligent item analyzer + in-built Inventory Tracker for flippers/resellers that identifies any item and tells how much profit you'll make before you buy (works for both in-person and online sourcing) - Underpriced.app
I'm the developer of Underpriced.app, a tool I built specifically for flippers and resellers who are tired of guessing if a deal is actually worth their time.
Every reseller has been there: You see something at a thrift store or on Facebook Marketplace, think "that might be worth something," but you're not sure. So you either pass and potentially miss out on $200 profit, or you buy and end up with another item that sits in your death pile for 6 months.
I built Underpriced to eliminate that uncertainty.
✨ Every Analysis Includes
Deal Tier – HOT DEAL / GOOD DEAL / FAIR / PASS
Deal Score (0-100) – Quantified deal quality
AI Confidence % – How certain the AI is about its valuation
Item Identification – Brand, model, era, key specs, authenticity markers
Category Detection – Auto-detects category and applies specialized expertise (electronics, fashion, furniture, collectibles, watches, etc.)
Market Value Range – Low/median/high based on real market data
Personal Use Value – Savings vs. buying new/retail
Flip Value – Profit, margin, demand, time to sell, best platforms
Red Flags – Overpriced items, potential scams, authenticity concerns, missing information
Things to Check – Category-specific inspection points before you buy
Data Sources – See what data backed the valuation
🎯 What Makes This Different From "Just Googling It" or asking ChatGPT?
This isn't a price lookup. It's a flip-focused analysis engine that tells you:
Exact profit potential – Not just market value, but YOUR profit after fees, shipping estimates, and your purchase price
Profit margin % – Know instantly if it's a 20% flip or a 200% flip
Demand level – Is this a quick flip or a slow burn? (High/Medium/Low)
Time to sell estimate – Days, weeks, or months?
Best platforms to sell on – eBay, Poshmark, Mercari, FB Marketplace – where will THIS item sell fastest and for the most?
Deal Score (0-100) – Instant gut-check. 80+ = grab it. Under 40 = walk away.
One screenshot. 15-30 seconds. You know if it's worth buying.
🔥 Two Ways to Use It
📱 Online Sourcing Mode
Browsing Facebook Marketplace, eBay, Craigslist, OfferUp, or any online listing? Screenshot it. Get instant analysis with:
What it is (brand, model, year, specs)
What it's actually worth
Your profit if you flip it
Red flags to watch for
Platform-specific fee calculations
🏷️ In-Person Sourcing Mode
At a thrift store, garage sale, estate sale, or flea market? Snap a photo of the item and price tag. Get the same comprehensive analysis in seconds – while you're still standing there deciding.
No more "let me look this up" while someone else grabs it. No more buying blind and hoping.
🧩 Chrome Extension
Install the extension and analyze listings without leaving the page:
One click on any eBay, Facebook Marketplace, Craigslist, OfferUp, Mercari, or Poshmark listing
Results appear in a popup – no tab switching
Select specific areas to analyze (great for multi-item listings)
Same powerful analysis, faster workflow
📋 Flip Tracker – Your Reselling Command Center
A complete flip tracking system built into the app:
Track Every Flip
Purchase details – What you paid, where you sourced it, date acquired
Listing details – Where you listed, asking price, listing date
Sale details – Final sale price, fees, shipping costs, profit
Status tracking – Sourced → Listed → Sold
Real-Time Analytics
Total profit across all flips
Average ROI %
Average days to sell
Best performing categories
Profit trends over time
Why This Matters
Most resellers track nothing or use messy spreadsheets. This gives you actual business intelligence:
Know your true ROI (not what you think it is)
Identify what categories make you the most money
See how long inventory actually sits
Make smarter sourcing decisions based on YOUR data
💎 Premium AI Tools (Reseller Tier+)
These are the features that turn casual flippers into serious resellers:
🧠 Deep Dive
One-click comprehensive market research:
Price history and trends
Cross-platform price comparison
Authentication tips for your specific item
Detailed condition impact on value
Expert-level verdict
💬 Negotiator
AI-generated negotiation strategy:
Leverage points specific to the listing
Target price recommendation
Copy-paste messages ready to send the seller
Counter-offer scripts
Walk-away price
📈 Plan My Flip
Complete listing generator:
SEO-optimized titles
Professional descriptions (copy-paste ready)
Pricing strategy with minimum/target/aspirational prices
Photo tips specific to your item
Platform-specific recommendations
Shipping suggestions
📊 eBay Comps (Beta)
Real sold listing data pulled directly from eBay:
Actual recent sale prices (not asking prices)
Median, low, and high sale prices
Condition-based price breakdown
Sample size and data quality indicators
Verifies AI estimates with real market data
🚀 Try It Free
5 free analyses to start – no credit card required.
Happy flipping 🤝
